﻿//
// (C) Copyright 2009 Irantha Suwandarathna (iranthas@hotmail.com)
// All rights reserved.
//

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use _in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions _in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer _in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using EffiProz.Core.Errors;
using EffiProz.Core.Lib;

namespace EffiProz.Core.DataTypes
{
    public class ClobType : CharacterType
    {
        const long maxClobPrecision = 1024L * 1024 * 1024 * 1024;
        const int defaultClobSize = 1024 * 1024 * 16;

        public ClobType()
            : base(Types.SQL_CLOB, defaultClobSize)
        {

        }

        public ClobType(long precision)
            : base(Types.SQL_CLOB, precision)
        {

        }

        public override int displaySize()
        {
            return precision > int.MaxValue ? int.MaxValue
                                                 : (int)precision;
        }

        public override int getAdoTypeCode()
        {
            return (int)DbType.String;
        }

        public override String getCSharpClassName()
        {
            return "System.Char[]";
        }

        public override int getSQLGenericTypeCode()
        {
            return typeCode;
        }

        public override String getDefinition()
        {

            long factor = precision;
            String multiplier = null;

            if (precision % (1024) == 0)
            {
                if (precision % (1024 * 1024 * 1024) == 0)
                {
                    factor = precision / (1024 * 1024 * 1024);
                    multiplier = Tokens.T_G_FACTOR;
                }
                else if (precision % (1024 * 1024) == 0)
                {
                    factor = precision / (1024 * 1024);
                    multiplier = Tokens.T_M_FACTOR;
                }
                else
                {
                    factor = precision / (1024);
                    multiplier = Tokens.T_K_FACTOR;
                }
            }

            StringBuilder sb = new StringBuilder(16);

            sb.Append(getNameString());
            sb.Append('(');
            sb.Append(factor);

            if (multiplier != null)
            {
                sb.Append(multiplier);
            }

            sb.Append(')');

            return sb.ToString();
        }

        public override long getMaxPrecision()
        {
            return maxClobPrecision;
        }

        public override bool isLobType()
        {
            return true;
        }

        /** @todo implement comparison */
        public override int compare(Session session, Object a, Object b)
        {

            if (a == b)
            {
                return 0;
            }

            if (a == null)
            {
                return -1;
            }

            if (b == null)
            {
                return 1;
            }

            long aId = ((ClobData)a).getId();
            long bId = ((ClobData)b).getId();

            return (aId > bId) ? 1
                               : (bId > aId ? -1
                                            : 0);
        }

        public override Object convertToDefaultType(SessionInterface session, Object a)
        {

            if (a == null)
            {
                return null;
            }

            if (a is ClobData)
            {
                return a;
            }

            if (a is String)
            {
                ClobData clob = session.createClob(((String)a).Length);

                clob.setString(session, 0, (String)a);

                return clob;
            }

            throw Error.error(ErrorCode.X_42561);
        }

        public override String convertToString(Object a)
        {

            if (a == null)
            {
                return null;
            }

            return ((ClobData)a).ToString();
        }

        public override String convertToSQLString(Object a)
        {

            if (a == null)
            {
                return Tokens.T_NULL;
            }

            String s = convertToString(a);

            return StringConverter.toQuotedString(s, '\'', true);
        }

        public override long position(SessionInterface session, Object data,
                             Object otherData, SqlType otherType, long start)
        {

            if (otherType.typeCode == Types.SQL_CLOB)
            {
                return ((ClobData)data).position(session, (ClobData)otherData,
                                                  start);
            }
            else if (otherType.isCharacterType())
            {
                return ((ClobData)data).position(session, (String)otherData,
                                                  start);
            }
            else
            {
                throw Error.runtimeError(ErrorCode.U_S0500, "ClobType");
            }
        }
    }
}
